TABLE 12 FEATURES AVAILABLE IN CENTRAL OFFICES (BELL OPERATING COMPANIES) YEAR END TOTAL EQUAL ACCESS SIGNALING SYSTEISDN OFFICES OFFICES OFFICES OFFICES* 1980 9,195 0 0.0 % 0 0.0 % 0 0.0 % 1981 9,198 0 0.0 0 0.0 0 0.0 1982 9,173 0 0.0 0 0.0 0 0.0 1983 9,156 0 0.0 0 0.0 0 0.0 1984 9,102 124 1.4 0 0.0 0 0.0 1985 9,124 1,891 20.7 0 0.0 0 0.0 1986 9,167 3,623 39.5 0 0.0 0 0.0 1987 9,190 4,823 52.5 29 0.3 4 0.0 1988 9,300 6,071 65.3 435 4.7 82 0.9 1989 9,338 6,788 72.7 931 10.0 179 1.9 1990 9,872 7,950 80.5 2,428 24.6 600 6.1 1991 9,957 8,601 86.4 3,670 36.9 920 9.2 1992 10,069 9,292 92.3 5,437 54.0 1,219 12.1 1993 10,083 9,697 96.2 6,688 66.3 1,874 18.6 1994 10,021 9,933 99.1 8,334 83.2 2,391 23.9 EQUIPPED ACCESS LINES BY TYPE OF OFFICE (THOUSANDS) YEAR END TOTAL EQUAL ACCESS SIGNALING SYSTEISDN OFFICES** OFFICES OFFICES OFFICES* 1980 81,032 0 0.0 % 0 0.0 % 0 0.0 % 1981 82,581 0 0.0 0 0.0 0 0.0 1982 83,819 0 0.0 0 0.0 0 0.0 1983 86,186 146 0.2 0 0.0 0 0.0 1984 88,630 9,350 10.5 0 0.0 0 0.0 1985 91,455 49,241 53.8 0 0.0 0 0.0 1986 93,630 70,543 75.3 0 0.0 0 0.0 1987 96,593 81,743 84.6 1,035 1.1 12 0.0 1988 99,564 91,809 92.2 10,325 10.4 47 0.0 1989 102,684 97,410 94.9 21,917 21.3 111 0.1 1990 105,641 102,429 97.0 40,026 37.9 13,970 13.2 1991 107,387 105,413 98.2 57,327 53.4 20,567 19.2 1992 109,994 109,006 99.1 77,102 70.1 28,375 25.8 1993 113,369 112,992 99.7 92,492 81.6 39,875 35.2 1994 117,313 117,266 ### 109,585 93.4 56,849 48.5 SOURCE: 1980-89 REPORTED IN CC DOCKET 89-624. 1990-94 REPORTED IN ARMIS 43-07. BECAUSE OF THE DIFFERING SOURCES, THE DATA FOR 1989 AND EARLIER YEARS MAY NOT BE ENTIRELY CONSISTENT WITH THE DATA FOR 1990 AND LATER YEARS. * SIGNALING SYSTEM 7 SWITCH (SS7-317) ** ISDN BASIC ACCESS LINE CAPACITY REPORTED FOR 1990-1994.